Question

它不返回任何数字，它返回null。

SELECT round(GEOGRAPHY_DISTANCE("GEOGRAPHY_POINT(-97.741890, 30.219940)", "POLYGON ((-97.11090087890626 33.08693925905123,-96.52862548828126 33.063924198120645,-96.56158447265626 32.80343616698929,-97.06970214843751 32.778037985363675,-97.11090087890626 33.08693925905123))"),0) FROM DUAL;

SELECT GEOGRAPHY_WITHIN_DISTANCE("GEOGRAPHY_POINT(96.843820, 32.926290)","POLYGON ((-97.11090087890626 33.08693925905123,-96.52862548828126 33.063924198120645,-96.56158447265626 32.80343616698929,-97.06970214843751 32.778037985363675,-97.11090087890626 33.08693925905123))",1000) from dual;

任何人都可以帮助使此memsql地理空间功能正常工作

Answer 1

扩展上面的Damien_The_Unbeliever的答案，GEOGRAPHY_POINT语法不应放在字符串内。您可以使用WKT语法POINT(long lat)或使用GEOGRAPHY_POINT语法（但不能使用字符串）在字符串内定义点。

因此对于第一个无效的查询：

memsql> SELECT round(GEOGRAPHY_DISTANCE("GEOGRAPHY_POINT(-97.741890, 30.219940)", "POLYGON ((-97.11090087890626 33.08693925905123,-96.52862548828126 33.063924198120645,-96.56158447265626 32.80343616698929,-97.06970214843751 32.778037985363675,-97.11090087890626 33.08693925905123))"),0) FROM DUAL;
+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| round(GEOGRAPHY_DISTANCE("GEOGRAPHY_POINT(-97.741890, 30.219940)", "POLYGON ((-97.11090087890626 33.08693925905123,-96.52862548828126 33.063924198120645,-96.56158447265626 32.80343616698929,-97.06970214843751 32.778037985363675,-97.11090087890626 33.086939 |
+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|                                                                                                                                                                                                                                                             NULL |
+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set, 1 warning (0.39 sec)

memsql> show warnings;
+---------+------+----------------------------------------------------+
| Level   | Code | Message                                            |
+---------+------+----------------------------------------------------+
| Warning | 1862 | You have an error in your WKT syntax at position 0 |
+---------+------+----------------------------------------------------+
1 row in set (0.00 sec)

您可以正确地将其写为以下两个之一：

memsql> SELECT round(GEOGRAPHY_DISTANCE("POINT(-97.741890 30.219940)", "POLYGON ((-97.11090087890626 33.08693925905123,-96.52862548828126 33.063924198120645,-96.56158447265626 32.80343616698929,-97.06970214843751 32.778037985363675,-97.11090087890626 33.08693925905123))"),0) FROM DUAL;
+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| round(GEOGRAPHY_DISTANCE("POINT(-97.741890 30.219940)", "POLYGON ((-97.11090087890626 33.08693925905123,-96.52862548828126 33.063924198120645,-96.56158447265626 32.80343616698929,-97.06970214843751 32.778037985363675,-97.11090087890626 33.08693925905123))" |
+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|                                                                                                                                                                                                                                                           291334 |
+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.31 sec)

memsql> SELECT round(GEOGRAPHY_DISTANCE(GEOGRAPHY_POINT(-97.741890, 30.219940), "POLYGON ((-97.11090087890626 33.08693925905123,-96.52862548828126 33.063924198120645,-96.56158447265626 32.80343616698929,-97.06970214843751 32.778037985363675,-97.11090087890626 33.08693925905123))"),0) FROM DUAL;
+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| round(GEOGRAPHY_DISTANCE(GEOGRAPHY_POINT(-97.741890, 30.219940), "POLYGON ((-97.11090087890626 33.08693925905123,-96.52862548828126 33.063924198120645,-96.56158447265626 32.80343616698929,-97.06970214843751 32.778037985363675,-97.11090087890626 33.08693925 |
+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|                                                                                                                                                                                                                                                           291334 |
+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.54 sec)

MemSql GEOGRAPHY_DISTANCE，GEOGRAPHY_CONTAINS，GEOGRAPHY_WITHIN_DISTANCE无法正常工作并返回null

1 个答案: